We present a calculation of the Vector Form Factor at the next-to-leading order in the 1/NC expansion, within the framework of Resonance Chiral Theory. The calculation is performed in the chiral… (More)

We study the mass, width and couplings of the lightest resonance multiplet with I (JPC) = 1 (1−−) quantum numbers. Effective field theories based on chiral symmetry are employed in order to describe… (More)

We present a dispersive method which allows to investigate the low-energy couplings of chiral perturbation theory at the next-to-leading order (NLO) in the 1/NC expansion, keeping full control of… (More)

The Lattice results for the pion and kaon decay constants are analysed within the Resonance Chiral Theory framework in the large N C limit. The approximately linear behaviour of the observable at… (More)

We present a one-loop calculation of the oblique S and T parameters within strongly coupled models of electroweak symmetry breaking with a light Higgs-like boson. We use a general effective… (More)

Using the resonance chiral theory Lagrangian, we perform a calculation of the vector and axial-vector two-point functions at the next-to-leading order (NLO) in the 1/NC expansion. We have analyzed… (More)

The relation between the quark–gluon description of QCD and the hadronic picture is studied up to order α s. The analysis of the spin–1 correlators is developed within the large N C framework. Both… (More)

Padé Approximants can be used to go beyond Vector Meson Dominance in a systematic approximation. We illustrate this fact with the case of the pion vector form factor and extract values for the first… (More)

Antonio Pich, Ignasi Rosell, Joaqúın Santos, and Juan José Sanz-Cillero 1 Departament de F́ısica Teòrica, IFIC, Universitat de València – CSIC, Apt. Correus 22085, 46071 València, Spain 2… (More)

We present a critical analysis of Padé-based methods for the unitarization of low energy amplitudes. We show that the use of certain Padé Approximants to describe the resonance region may lead to… (More)